Scattered on the lower south-western slopes of Holyhead Mountain is a remarkable cluster of around twenty stone hut circles, locally known as Cytiau'r Gwyddelod — "the Irishmen's huts." The settlement was occupied from the late Iron Age into the Roman period, and several of the foundations still show the original entrance jambs and central hearth stones.
There is no entrance fee and no visitor centre — a kissing gate beside the South Stack road leads onto the site through gorse and heather. With the cliffs of Gogarth in view and the silence broken only by the wind and the gulls, the huts give a vivid sense of what coastal life on the very edge of Roman Britain looked like.